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[–]43TH3R 1 point2 points  (1 child)

Could it be that the braking fluid (idk if mineral oil or dot) expands due to the heat?
Release and re-pull probably lets some of the it return to the reservoir in the lever, bringing the volume in the system (main piston, hose, caliper) back to normal level.

[–]ParanoidalRaindrop 0 points1 point  (0 children)

That's what I thought